Testing Technology: National Standard For Towel Yarn Interwoven Fabric

Comparison of new and old national standards for technical towel

Humen Textile Co., Ltd

　　 New and old national standards for towel contrast

　　 towel The fabric consists of three loops. Towel can be divided into facial towel, bath towel, square towel, towel quilt, etc. according to the use, it is a kind of textile that can directly contact with human skin. Generally, pure cotton yarn is used as raw material, and the texture is soft.

GB / T 22864-2009 towel (referred to as the old standard) was jointly issued by the General Administration of quality supervision, inspection and Quarantine of the people's Republic of China (hereinafter referred to as the old standard) on April 21, 2009 and implemented on December 1, 2009. It has been more than ten years since the implementation of GB / T 22864-2009. With the development of towel products, the improvement of market demand and consumer quality requirements, China has issued a new version of towel standard GB / T 22864-2020 towel in 2020.

　　 GB / T 22864-2020 towel (hereinafter referred to as the new standard) was jointly issued by the State Administration of market supervision and administration and the National Standards Commission on April 28, 2020, and implemented on September 1, 2020, replacing GB / T , 22864-2009. The new standard modifies the quality index on the basis of the old standard. This paper analyzes and summarizes the differences between the new and old standards. GB / T 22864 "towel" standard is under the jurisdiction of National Technical Committee for standardization of household textiles.

Scope of application and definition of terms

The comparison of the application scope of the new standard and the old standard is shown in the table below.

The new standard modified the scope of application of the standard: for microfiber towel and disposable towel, the new standard is not applicable, while the old standard can be implemented by reference. For superfine fiber towel products, the standard FZ / T 62033-2016 "microfiber towel" can be implemented. For disposable towel, according to the production process (commonly used spunlaced nonwovens), select the appropriate standard for reference, and GB 15979 health standard can be implemented. Therefore, the scope of application of the new standard is more accurate.

Change of technical requirements

01 added the requirement of GB 31701

Towel products belong to the category of textile products, including infants and children's towels. If it belongs to infants and children's products, it shall comply with the provisions of GB 31701. Since GB Ю 31701 is a mandatory textile standard issued in 2015, the new standard will include GB 31701

02 added the assessment requirements for water extract of top grade towel

In the new standard, the water extract of towel is required to be in accordance with the provisions of GB / T for towel products with excellent quality grade. For the first-class products and qualified products, it is not required to assess the water extract of towel, as shown in the table below.

In GB / T 27754-2011 "household textiles towel water extract limit", the water extract limit of towel is shown in the table below. The evaluation indexes of water extract include pentachlorophenol content, liquid staining and transparency. Pentachlorophenol (PCP) is a traditional antiseptic for textiles, which can prevent the growth of fungi and inhibit the corrosion of bacteria. On October 27, 2017, the list of carcinogens published by the international agency for research on cancer (IARC) of the World Health Organization (who) was preliminarily collated for reference. Pentachlorophenol was included in the list of class I carcinogens. Pentachlorophenol (PCP) was detected according to GB / T h 18414.1-2006 textiles determination of chlorophenols Part 1: gas chromatography-mass spectrometry method. And the liquid staining and transparency of the extraction solution are also indicators that directly affect the use experience.

03 added the stipulation that the breaking strength of small size towel is not checked

In the new standard, the breaking strength of towel which is too small to be sampled normally can not be examined. Due to the size limit, it is allowed not to assess the breaking strength, but it does not mean that the breaking strength is not important. If the breaking strength is too low, the service life of the towel will be affected. Even if the product meets the standard requirements, it may still cause consumers' complaints.

This standard is applicable to woven towel products, and the breaking strength is tested according to GB / T 3923.1. Requirements for sampling in GB / T - 3923.1: the effective width of each sample shall be 50 mm, and the length shall be able to meet the clamping requirements of spacing length of 200 mm, and the length shall generally be greater than 250 mm. Actual common towel specifications: the size of normal towel (face towel) is about 34cm * 76cm; the size of normal towel is about 35cm * 35cm, and the size of square towel is 25cm * 25cm and 20cm * 20cm. Bath towel size: 70cm * 140cm. Whether it is necessary to assess the breaking strength depends on whether the towel products can be sampled.

The new and old standards have the same technical requirements for breaking strength, as shown in the table below.

04 depilation rate

In the new standard, the technical requirement index of depilation rate does not distinguish cutting towel from non cutting towel, that is to say, cutting towel and non cutting towel unify the assessment index. In the new standard, the technical requirements of hair removal rate of cut pile towel and non cut velvet towel are consistent with those of the old standard.

05 color fastness

For the color fastness to chlorine bleaching, the old standard included discoloration and staining, while the new standard only examined discoloration. The new standard does not assess the color fastness to chlorine bleaching for the towel which is clearly not allowed to be chlorine bleached. It is more difficult to evaluate the chlorine content. For the color fastness to wet rubbing, the old and new standards have the same points: the color fastness to rubbing is excellent, and the dark color of the first grade can be reduced by half. For the color fastness to wet rubbing, the differences between the old and the new standards are as follows: the qualified products in the old standard are required to be no less than grade 2-3; the qualified products in the new standard are required to be no less than grade 3 (pigment printing, dark color grade 2-3).

06 others

(1) the allowable degree of appearance quality index is modified. The new standard has more strict requirements for the qualified products, such as linear defects, strip defects and block defects of square towel, face towel, bath towel and towel quilt.

(2) added the appearance quality requirements of the four side seam edge thread head. In the sewing quality, the requirements for the edge thread head of the four side seam are added, including the requirements for the superior product (not allowed for the length of more than 1cm), the requirement for the first-class product (not allowed for the product with the length of more than 1.5cm), and the requirement for the qualified product (not allowed for the thread head above 2cm).

Change of test method

01 modified the test method of weight deviation rate

New standard: Determination of weight deviation rate: constant weight (weighing 10 pieces of square towel and face towel) is taken under the standard atmosphere specified in GB / T , and the weight deviation rate is calculated. Weight deviation rate is used for batch delivery. The new standard is directly weighed after adjusting humidity to constant weight, which is more simple and does not need to measure and convert moisture regain like the old standard.

Old standard: weight inspection of public determined moisture regain: the moisture regain during weighing shall be determined according to GB / T 9995, and the weight of public determined moisture regain shall be calculated according to GB / T 9994 (10 pieces of square towel and face towel shall be weighed).

02 modified the sampling position of water absorption test

New standard: 5.1.3 the determination of water absorption shall be carried out according to method a in GB / T -2019. When sampling, avoid coating, forging, embroidery and other parts that may be affected. The sampling position will affect the test results of water absorption, so the new standard has more specific requirements for sampling and has stronger operability.

Old standard: the determination of water absorption is carried out according to GB / T 22799a.

03 modified the fiber content test method

New standard: the determination of fiber content is carried out according to GB / T 2910 (all parts) and FZ / T 01057 (all parts).

Old standard: the determination of fiber content is carried out according to GB / T 2910 and GB / T 2911.

04 added the test method of towel water extract

The new standard increases the detection index of water extract of sample, so the test method of water extract is added accordingly. The determination of water extract in the sample shall be carried out in accordance with the provisions of GB / T . Take a quarter of the sample whose length is more than 1800mm and width is more than 1200mm, and use the sewing thread of this thread to cover the cutting edge.

05 change Appendix A from normative to informative

The provisions on towel defects in Appendix A of the new standard are only used as informative appendix for reference;

The provisions of towel defects in Appendix A of the old standard is a normative appendix as a part of the technical content of the standard.

Conclusion

In terms of technical requirements, the new standard adds the requirements of GB 31701, the technical requirements of water extract in products, and the indicators of qualified products with appearance quality are more strict, which all meet the development trend of product quality requirements. In terms of test methods, in addition to adding detection methods, the updated detection methods are more reasonable, more clear and more operable.